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// Copyright 2016 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef V8_CODEGEN_SOURCE_POSITION_H_
#define V8_CODEGEN_SOURCE_POSITION_H_
#include <ostream>
#include "src/common/globals.h"
#include "src/flags/flags.h"
#include "src/handles/handles.h"
#include "src/utils/utils.h"
namespace v8 {
namespace internal {
class Code;
class OptimizedCompilationInfo;
class Script;
class SharedFunctionInfo;
struct SourcePositionInfo;
// SourcePosition stores
// - is_external (1 bit true/false)
//
// - if is_external is true:
// - external_line (20 bits, non-negative int)
// - external_file_id (10 bits, non-negative int)
//
// - if is_external is false:
// - script_offset (30 bit non-negative int or kNoSourcePosition)
//
// - In both cases, there is an inlining_id.
// - inlining_id (16 bit non-negative int or kNotInlined).
//
// An "external" SourcePosition is one given by a file_id and a line,
// suitable for embedding references to .cc or .tq files.
// Otherwise, a SourcePosition contains an offset into a JavaScript
// file.
//
// A defined inlining_id refers to positions in
// OptimizedCompilationInfo::inlined_functions or
// DeoptimizationData::InliningPositions, depending on the compilation stage.
class SourcePosition final {
public:
explicit SourcePosition(int script_offset, int inlining_id = kNotInlined)
: value_(0) {
SetIsExternal(false);
SetScriptOffset(script_offset);
SetInliningId(inlining_id);
}
// External SourcePositions should use the following method to construct
// SourcePositions to avoid confusion.
static SourcePosition External(int line, int file_id) {
return SourcePosition(line, file_id, kNotInlined);
}
static SourcePosition Unknown() { return SourcePosition(kNoSourcePosition); }
bool IsKnown() const {
if (IsExternal()) return true;
return ScriptOffset() != kNoSourcePosition || InliningId() != kNotInlined;
}
bool isInlined() const {
if (IsExternal()) return false;
return InliningId() != kNotInlined;
}
bool IsExternal() const { return IsExternalField::decode(value_); }
bool IsJavaScript() const { return !IsExternal(); }
int ExternalLine() const {
DCHECK(IsExternal());
return ExternalLineField::decode(value_);
}
int ExternalFileId() const {
DCHECK(IsExternal());
return ExternalFileIdField::decode(value_);
}
// Assumes that the code object is optimized
std::vector<SourcePositionInfo> InliningStack(Handle<Code> code) const;
std::vector<SourcePositionInfo> InliningStack(
OptimizedCompilationInfo* cinfo) const;
void Print(std::ostream& out, Code code) const;
void PrintJson(std::ostream& out) const;
int ScriptOffset() const {
DCHECK(IsJavaScript());
return ScriptOffsetField::decode(value_) - 1;
}
int InliningId() const { return InliningIdField::decode(value_) - 1; }
void SetIsExternal(bool external) {
value_ = IsExternalField::update(value_, external);
}
void SetExternalLine(int line) {
DCHECK(IsExternal());
DCHECK(line <= ExternalLineField::kMax - 1);
value_ = ExternalLineField::update(value_, line);
}
void SetExternalFileId(int file_id) {
DCHECK(IsExternal());
DCHECK(file_id <= ExternalFileIdField::kMax - 1);
value_ = ExternalFileIdField::update(value_, file_id);
}
void SetScriptOffset(int script_offset) {
DCHECK(IsJavaScript());
DCHECK(script_offset <= ScriptOffsetField::kMax - 2);
DCHECK_GE(script_offset, kNoSourcePosition);
value_ = ScriptOffsetField::update(value_, script_offset + 1);
}
void SetInliningId(int inlining_id) {
DCHECK(inlining_id <= InliningIdField::kMax - 2);
DCHECK_GE(inlining_id, kNotInlined);
value_ = InliningIdField::update(value_, inlining_id + 1);
}
static const int kNotInlined = -1;
STATIC_ASSERT(kNoSourcePosition == -1);
int64_t raw() const { return static_cast<int64_t>(value_); }
static SourcePosition FromRaw(int64_t raw) {
SourcePosition position = Unknown();
DCHECK_GE(raw, 0);
position.value_ = static_cast<uint64_t>(raw);
return position;
}
private:
// Used by SourcePosition::External(line, file_id).
SourcePosition(int line, int file_id, int inlining_id) : value_(0) {
SetIsExternal(true);
SetExternalLine(line);
SetExternalFileId(file_id);
SetInliningId(inlining_id);
}
void Print(std::ostream& out, SharedFunctionInfo function) const;
using IsExternalField = BitField64<bool, 0, 1>;
// The two below are only used if IsExternal() is true.
using ExternalLineField = BitField64<int, 1, 20>;
using ExternalFileIdField = BitField64<int, 21, 10>;
// ScriptOffsetField is only used if IsExternal() is false.
using ScriptOffsetField = BitField64<int, 1, 30>;
// InliningId is in the high bits for better compression in
// SourcePositionTable.
using InliningIdField = BitField64<int, 31, 16>;
// Leaving the highest bit untouched to allow for signed conversion.
uint64_t value_;
};
inline bool operator==(const SourcePosition& lhs, const SourcePosition& rhs) {
return lhs.raw() == rhs.raw();
}
inline bool operator!=(const SourcePosition& lhs, const SourcePosition& rhs) {
return !(lhs == rhs);
}
struct InliningPosition {
// position of the inlined call
SourcePosition position = SourcePosition::Unknown();
// references position in DeoptimizationData::literals()
int inlined_function_id;
};
struct SourcePositionInfo {
SourcePositionInfo(SourcePosition pos, Handle<SharedFunctionInfo> f);
SourcePosition position;
Handle<SharedFunctionInfo> shared;
Handle<Script> script;
int line = -1;
int column = -1;
};
std::ostream& operator<<(std::ostream& out, const SourcePosition& pos);
std::ostream& operator<<(std::ostream& out, const SourcePositionInfo& pos);
std::ostream& operator<<(std::ostream& out,
const std::vector<SourcePositionInfo>& stack);
} // namespace internal
} // namespace v8
#endif // V8_CODEGEN_SOURCE_POSITION_H_
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